Single or dual carb question.....

This is where discussions of EFI systems, Dual Carbs, Single Carb mods and plans can be discussed and shared.

If you are working on or have a problem with stock carbs then your questions do not belong here, please post them in the Goldwing Tech Discussions Forum.

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83Interstate
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Single or dual carb question.....

#1

Post by 83Interstate »

I'm wanting to do a different carb setup. Would like dual carbs but don't want weber or solex. Would like to run a pair of cv carbs off of a pair of short run intakes and place the carbs near the stock location. I've searched my fuzzy tail off looking everywhere and found nothing but weber solex and hotts dual strombergs. Anybody have any links to ANYONE ANYWHERE who have done anything like this? Even a pair of round or flat slide mikuni carbs or similar would be a place to start learning what I'm up against. I'm thinking copper tubing. Thanks for any help.
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Re: Single or dual carb question.....

#2

Post by sunnbobb »

cant recall anything like that.. a guy did mount some Vmax carbs.. did writeup somewhere around here
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Re: Single or dual carb question.....

#3

Post by robin1731 »

There was a guy that used some carbs off a 450 Honda I think it was, Still 4 carbs though. I have them around here somewhere I think.

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Re: Single or dual carb question.....

#4

Post by gltriker »

sunnbobb wrote: Sat Nov 21, 2020 5:01 am cant recall anything like that.. a guy did mount some Vmax carbs.. did writeup somewhere around here
ericheath maybe?
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83Interstate
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Re: Single or dual carb question.....

#5

Post by 83Interstate »

gltriker wrote: Sat Nov 21, 2020 11:37 am
sunnbobb wrote: Sat Nov 21, 2020 5:01 am cant recall anything like that.. a guy did mount some Vmax carbs.. did writeup somewhere around here
ericheath maybe?
He tried the vf1100c carbs and some dual 2bbl carbs I believe.
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Re: Single or dual carb question.....

#6

Post by 83Interstate »

sunnbobb wrote: Sat Nov 21, 2020 5:01 am cant recall anything like that.. a guy did mount some Vmax carbs.. did writeup somewhere around here
I have read all about that. That is a really interesting modification right there. I enjoyed reading that one. It looks really good also.
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Re: Single or dual carb question.....

#7

Post by ericheath »

I tried two Hitachi carbs. Got fed up trying to sync them and ordered better linkage. If you’re found two, do some research on linkage setups and save yourself some time and hassle. Try to come up with something that has some adjustments for synchronizing. The one thing a little odd about putting two carbs on a Wing is the air charge will shoot through for two pulls then pause for two pulls. 1-3 draws, then 2-4 draws. I’m not smart enough to know how that will affect flow. My gut says the first draw will be a little less than the second draw. (The second will still have inertia) maybe CV carbs will compensate for that? Maybe not.

I threw my V65 carbs back on and ten minutes later totaled my bike. I was an April Fool. Thought I would get another bike and try again but Covid has dampened that. The day before yesterday the doc gave me the big C word. Melanoma in situ. Okay that’s an M. Perhaps the best you can get if you have to. Also had some heart issues, not major I don’t think. More tests Friday. Riding is off the table for me for now.
Whatever I suggest here should be given ample time for a moderator to delicately correct. I apologize in advance.
77 WING, 1200 engine with 77 heads, cams, gl1100 foot pegs, Magna V65 front end, 764A carbs, [-gone Suzuki M109 monoshock--, replaced with gl1100 shocks] gl 1200 swing arm, gl1500 final drive, wheel and rear brakes Valkyrie seat, Meanstreak tank, Sportster pipes, Power Arc ignition off crank.
77 Wing. black
83 Wing, in pieces
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Re: Single or dual carb question.....

#8

Post by CYBORG »

Sorry to hear about your health issues....Hang in there action1 action1 action1 action1
1978 custom GL1000
1977 custom with 1200 engine
1985 gl1200
83Interstate
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Re: Single or dual carb question.....

#9

Post by 83Interstate »

ericheath wrote: Wed Nov 25, 2020 7:27 pm I tried two Hitachi carbs. Got fed up trying to sync them and ordered better linkage. If you’re found two, do some research on linkage setups and save yourself some time and hassle. Try to come up with something that has some adjustments for synchronizing. The one thing a little odd about putting two carbs on a Wing is the air charge will shoot through for two pulls then pause for two pulls. 1-3 draws, then 2-4 draws. I’m not smart enough to know how that will affect flow. My gut says the first draw will be a little less than the second draw. (The second will still have inertia) maybe CV carbs will compensate for that? Maybe not.

I threw my V65 carbs back on and ten minutes later totaled my bike. I was an April Fool. Thought I would get another bike and try again but Covid has dampened that. The day before yesterday the doc gave me the big C word. Melanoma in situ. Okay that’s an M. Perhaps the best you can get if you have to. Also had some heart issues, not major I don’t think. More tests Friday. Riding is off the table for me for now.
Wow brother I'm sorry to hear about that. There are some of you guys that I have learned a lot from. I am blessed that I have been able to learn what I have from what has already been done or at least tried.

And Eric if once you are able to ride again if there's anything I can do to help you get back on two wheels just say the word and I will do whatever is in my power to put some bugs back in your teeth.
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Re: Single or dual carb question.....

#10

Post by ericheath »

I should report I have made good progress health wise. I am a Celiac person. I had stopped taking my calcium/magnesium supplements which is necessary for many Celiac patient about six-eight weeks ago. I took one Cal/Mag pill as soon as I came back from my first EKG and began to feel better in just a few hours. One day later I had a few missed beats when I woke. Ever since it has not missed a beat! Had a second EKG at my cardiologist and it was nearly perfect, better than my EKG from two years ago where they did find I had a partial atrial block. Very minor and quite common especially in distance athletes- which I WAS many years ago. Cardiologist said I would clear for anything.

The melanoma was more fully removed yesterday. It is stage zero, so I’m probably in the clear there. Have to avoid sun and wear protection whenever outside and be examined on a regular basis.

Riding is likely in my future. Yay! My bucket list, if there is one, is to buy a sailboat and sail it on my own. I’m pretty sure I would have had one by now, but this Covid19 crap has sure shut that down.

Hope to pick up a new project bike one of these days. Probably a 1200, but maybe a 1500 I can “butcher.” I got my garage insulated so I have a decent place to work in winter. So much brighter! It’s still above freezing in there just from the thermal mass of the concrete floor. I used my IR thermometer to shoot floor temps. The perimeter is down the the lower 30’s, but the center is still nearly 40 degrees F.

Cheers!
Whatever I suggest here should be given ample time for a moderator to delicately correct. I apologize in advance.
77 WING, 1200 engine with 77 heads, cams, gl1100 foot pegs, Magna V65 front end, 764A carbs, [-gone Suzuki M109 monoshock--, replaced with gl1100 shocks] gl 1200 swing arm, gl1500 final drive, wheel and rear brakes Valkyrie seat, Meanstreak tank, Sportster pipes, Power Arc ignition off crank.
77 Wing. black
83 Wing, in pieces
"Continuing education is important even if the subject matter is fairly useless (as in this case)."---Greg Foresi
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Re: Single or dual carb question.....

#11

Post by Rat »

It’s a real buyer's market for boats !!

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Re: Single or dual carb question.....

#12

Post by heraldhamster »

hey man, we have a 16 ft. Com-Pac sailboat I bought for SWBO's BD years ago that we're never gonna finish...
It's on a REALLY nice galv. shoreline trailer but the trailer bunks need replacing. I wanted to do HDPE but never got a 'round tuit.

let's talk! :-D

https://en.m.wikipedia.org/wiki/Com-Pac_16

glad yer Mel is not serious. I just had one cut off my neck back in April.
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Re: Single or dual carb question.....

#13

Post by 83Interstate »

So I have decided on my project. After a few months of reading a few months of thinking drawing countless designs and coming up right back to square one and then realizing that with the way I modified my frame I don't have room for a single solex or single anything under the tank. I have decided to use a S&S Super E carburetor. One reason is because I plan to go turbo with it at some point and that carburetor is easily adaptable. I am starting my manifold today and this picture is where I'm at as of posting this comment. Long ways to go. I'm using a larger inner plenum to create somewhat of a "swirl pot" if you will. I think one of the reasons the single carbs tend to lose upper RPM Power is the fuel does not get a chance to mix well enough in a small plenum area. I may be wrong but this will be my first complete manifold I have built other than using a Type 3 Volkswagen manifold and a Ford Escort carburetor with some rubber hose as runners. The plenum is a piece of 4 inch diesel stack pipe and runners are 1.25 ID steel pipe.

I will honestly welcome any advice being I am somewhat out of my comfort zone but I will get it accomplished 1 way or another.
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Re: Single or dual carb question.....

#14

Post by dontwantapickle »

83Interstate wrote: Tue Jan 12, 2021 12:59 pm I'm using a larger inner plenum to create somewhat of a "swirl pot" if you will. I think one of the reasons the single carbs tend to lose upper RPM Power is the fuel does not get a chance to mix well enough in a small plenum area. I may be wrong but this will be my first complete manifold I have built other than using a Type 3 Volkswagen manifold and a Ford Escort carburetor with some rubber hose as runners.
I have always been of the mindset that it is the long intake runners that effect the high rpm power in
the single carb conversions.
Every single carb manifold that I have seen puts the carb farther away from the intake valves than the
stock setup does.
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Re: Single or dual carb question.....

#15

Post by MikeNTexas »

83Interstate wrote: Tue Jan 12, 2021 12:59 pm So I have decided on my project. After a few months of reading a few months of thinking drawing countless designs and coming up right back to square one and then realizing that with the way I modified my frame I don't have room for a single solex or single anything under the tank. I have decided to use a S&S Super E carburetor. One reason is because I plan to go turbo with it at some point and that carburetor is easily adaptable. I am starting my manifold today and this picture is where I'm at as of posting this comment. Long ways to go. I'm using a larger inner plenum to create somewhat of a "swirl pot" if you will. I think one of the reasons the single carbs tend to lose upper RPM Power is the fuel does not get a chance to mix well enough in a small plenum area. I may be wrong but this will be my first complete manifold I have built other than using a Type 3 Volkswagen manifold and a Ford Escort carburetor with some rubber hose as runners. The plenum is a piece of 4 inch diesel stack pipe and runners are 1.25 ID steel pipe.

I will honestly welcome any advice being I am somewhat out of my comfort zone but I will get it accomplished 1 way or another.
Looks like an interesting design but it has always been my opinion that a large plenum like your using slows the air flow down dramatically and could cause the atomized fuel to separate from the mix and puddle in the bottom of the plenum. If it was me I would keep it as small as possible to keep the air flow up.
1975 GL1000 Restored (sold)
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